6109.13.1. Cylinders at a location open to the public shall be protected by either of the following:   (i) An enclosure in accordance with section 6.18.4.1 of NFPA 58 as listed in rule 1301:7-7-80 of the Administrative Code.   (ii) A lockable ventilated metal locker or rack that prevents tampering with valves and pilferage of the cylinder.   (a) 6109.13.1.1 Protection against vehicle impact shall be provided in accordance with good engineering practice where vehicle traffic normally is expected at that location.